Brazilian Journal of Physics
On-line version ISSN 1678-4448
PAIAO, J. R. B.; PEREIRA, F. and WATANABE, S.. Soda-lime glass with gradient of refraction index (GRIN). Braz. J. Phys. [online]. 2001, vol.31, n.1, pp. 77-79. ISSN 1678-4448. http://dx.doi.org/10.1590/S0103-97332001000100014.
In a soda-lime glass provided by Companhia Vidraria Santa Marina, subsidiary of French Saint-Gobain, we induced a gradient of refraction of index (GRIN) by exchange of Na+ in glass by Li+ at 550oC for 12, 24, 36 and 48 hours and varying bath temperature at 525oC, 550oC, 575oC and 600oC for fixed time of 48 hours. Dn = 0.0107 ± 0.0005 and GRIN depth of about 2.4mm were obtained for the ion exchange at 550oC for 48 hours. The GRIN profile was fitted with er fc(x) function and then obtained the diffusion coefficient D = (1.6 ± 0.3) · 10-6 mm2/s.